摘要
基于元素间混合焓差异,通过在Mg基非晶合金中添加Fe元素,使合金凝固过程中析出原位自生富Fe相,从而制备出原位自生相增强镁基非晶复合材料.研究发现,富Fe相均匀分散在镁基非晶合金基体中,平均尺寸为8 μm,体积含量约为14％.相比于基体材料的脆性断裂,原位自生富Fe相增强镁基非晶复合材料表现出明显的屈服与塑性变形,塑性形变量达9.5％,并且断裂强度也较基体合金有所提高.通过对断面的分析发现富Fe相在变形过程中可有效阻碍非晶基体中主剪切带的快速扩展,使其发生偏转和增殖,生成多重剪切带,使复合材料的力学性能显著提高.
Abstract
Based on the differences in enthalpy of mixing between elements,we had successfully introduced in-situ Fe-rich phase during solidification via microalloying with Fe into Mg-based amorphous alloys.The Fe-rich phase distributed in the Mg-based amorphous alloy matrix homogeneously with an average size of 8 μm and volume fraction of 14％.Compared to the brittle fracture of the base monolithic amorphous alloy,the in-situ Fe-rich phase reinforced Mg-based amorphous alloy matrix composites showed obvious yielding and plastic deformation.The plastic strain was as high as 9.5％,the fracture strength was also higher than the base alloy.By observing the fracture morphology,we found that the Fe-rich phase could effectively hinder the rapid propagation of main shear band in the matrix,causing the deflection and multiplication of it.The generated multiple shear bands contributed to the improved mechanical properties of the composites.
基金项目
国家自然科学基金(52101138)
湖北省自然科学基金(2023AFB798)
深圳市科技计划资助(JCYJ20220530160813032)
西北工业大学凝固技术国家重点试验室开放课题(SKLSP202309)
国家科技期刊平台
NSTL
万方数据